The effectiveness of the playground environment to promote PA has been considered as a complementary setting to physical education. Energy expenditure and physical activity levels have increased during playtime following the implementation of playtime-based interventions. In order to advance knowledge of children’s PA during playtime, a number of key issues for consideration in future research are detailed. Research on children’s use of playtime to be physically active and the extent of the contribution of playtime to daily PA guidelines is warranted. This 2006 study is from Liverpool.